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310            MOKPHOLOGY AND EVOLUTION
muscles. It also supplies the ankle-joint and flexor brevis digitorutn, and divides into three terminal branches:—
(1)   Muscular to the abductor minimi digiti.
(2)   Internal plantar nerve to the abductor hallucis, flexor brevis hallucis, adductor hallucis, lumbricales, the joints of the foot and the skin of the four inner toes.
(3)   Lateral plantar nerve to   the  adductor  hallucis, abductor   minimi   digiti,   flexor   brevis  minimi   digiti, interossei, joints   of   the foot  and   skin on   the  inner side of the fifth toe.
In the other Apes the chief points to note are that the anterior tibial nerve does not reach the skin of the foot in the Orang, and the musculo-cutaneous nerve supplies the peroneal muscles.
The pudenda! nerve in the Chimpanzee emerges through the sciatic notch and forms a prominent neigh-
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bour for the pudendal vessels. It lies in the outer wall of the ischio-rectal fossa and supplies the rectum, sphincter ani, levator ani, sphincter vaginae, ischio-cavernosus, and skin of the perineum.
Section D.—THE SYMPATHETIC NERVOUS SYSTEM.
In the Chimpanzee (figs. 52 and 53) the long, oval superior cervical ganglion (.S.C.G-.J extends from the level of the hard palate to the level of the hyoid bone. It gives off the following branches:—
Communicating Branches:—
(1)  To the glosso-pharyngeal (IX), hypoglossal (XII),
and ganglion nodosum of the vagus (G.N.).
(2)  To the superior laryngeal branch of the vagus (6). (3)'To the first and second cervical nerves.